1 files changed, 48 insertions, 0 deletions
diff --git a/libcxx/test/std/utilities/function.objects/comparisons/constexpr_init.pass.cpp b/libcxx/test/std/utilities/function.objects/comparisons/constexpr_init.pass.cpp
new file mode 100644
index 00000000000..6ebca1e3cda
--- /dev/null
+++ b/libcxx/test/std/utilities/function.objects/comparisons/constexpr_init.pass.cpp
@@ -0,0 +1,48 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, c++11
+
+// XFAIL: gcc-7, gcc-8
+
+// <functional>
+
+// equal_to, not_equal_to, less, et al.
+
+// Test that these types can be constructed w/o an initializer in a constexpr
+// context. This is specifically testing gcc.gnu.org/PR83921
+
+
+#include <functional>
+#include "test_macros.h"
+
+template <class T>
+constexpr bool test_constexpr_context() {
+  std::equal_to<T> eq;
+  ((void)eq);
+  std::not_equal_to<T> neq;
+  ((void)neq);
+  std::less<T> l;
+  ((void)l);
+  std::less_equal<T> le;
+  ((void)le);
+  std::greater<T> g;
+  ((void)g);
+  std::greater_equal<T> ge;
+  ((void)ge);
+  return true;
+}
+
+static_assert(test_constexpr_context<int>(), "");
+static_assert(test_constexpr_context<void>(), "");
+
+
+int main() {
+
+}